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ATPL Bgt Quiz 18

ATPL Bgt Quiz  18

Basic Gas Turbine Questions

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Quiz Questions And Answers

The purpose of a diffuser in a gas turbine engine

Lower pressure and lower temperature
Raise pressure and lower velocity
Raise velocity and lower temperature

'Tertiary creep' in a turbine blade of a gas turbine engine means

Blade creep experienced on the test bench by the manufacturer
Normal blade creep over the life of the engine
Blade creep to the point where it would be detrimental to continue to run the engine

If a compressor blade stall occurs in a gas turbine engine

The smooth flow of air over the blading breaks away and causes an interruption of airflow through the engine
The compressor ceases to rotate
The fuel flow burners will cease immediately

Gas turbine engine compressor stall may be caused by

Prolonged ground running with the air intake guard screens fitted
An unserviceable igniter plug
An unstable airflow through the compressor

For a given RPM, thrust output from a gas turbine engine will be а greatest

At MSL under ISA conditions
At high altitudes
At MSL under ISA plus temperatures

You would expect to find the highest gas temperature in a turbojet engine

At the end of the compressor
In the combustion chamber
In the jet pipe

The term SFC (Specific Fuel Consumption) means

Units of fuel used per unit of thrust per hour
Amount of fuel used in a specified engine RPM range
Distance travelled per unit of fuel

The term SFC (Specific Fuel Consumption) means

Units of fuel used per unit of thrust per hour
Distance travelled per unit of fuel
Amount of fuel used in a specified engine RPM range

A turbofan is not as efficient as a turboprop at low speeds. This is because the turbofan has

A lower air mass accelerated to a higher velocity
A higher air mass accelerated to a higher velocity
A higher air mass accelerated to a lower velocity

The main reason for a limit on the maximum gas temperature in a gas turbine engine is

To prevent overheating of the turbine
To prevent burning of the thermocouples
To prevent a thermal runaway
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